My ACA1230/28 was a tight fit as well.
I had to take off the case, and I also (felt) I had to loosen the screws that hold the motherboard down a bit. Just a few turns so the motherboard would float a bit. Then I was able to attach the card and tighten the screws back up..

Not sure that I "had" to loosen those screws, but it made the install easier for me..

Then, I still had to slide the card back just a tiny bit to get it to work, but I had to do that with my 8M card as well, so that's just my beat up old 1200. ;-)